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. 2022 Apr 19;12:836409. doi: 10.3389/fcimb.2022.836409

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Copyright © 2022 Zhang, Wang, Wen, Gu, Liu and Li

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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China curbed asymptomatic spread in its late stage of COVID-19. (A) Most cases of COVID-19 in the late phase of the pandemic in China were asymptomatic. (B) The rate of asymptomatic infection among imported cases in the late stage of the pandemic in China was relatively high. (C) Among the newly diagnosed cases, a higher proportion exhibited asymptomatic infection in the late phase of the pandemic in China than in the early phase. (D) Asymptomatic infection (pink) can lead to imperceptible subexponential or exponential transmission.